Intro to Tissue Types Flashcards
What are the three germ layers?
endoderm
mesoderm
ectoderm
What is endoderm?
Inner germ layer that forms lining of digestive tract and derivatives.
What is mesoderm?
Middle germ layer that forms tissues such as muscle, bone, and blood vessel
What is ectoderm?
Outer germ layer that forms skin and neuroectoderm
What are the four primary tissues?
Epithelial
Connective
Muscle
Nervous
What is the functions of epithelia?
Protects underlying structures Acts as a Barrier Permits passage of substances Secretes substances Absorbs substance
What functions does cell layers and shapes determine?
Diffusion Filtration Secretion Absorption Protection
What is the function of microvilli?
Increase surface area absorption or secretion
What is the function of Cilia?
Move materials across cell surface
Name three cell connections.
Desmosomes
Tight
Gap
Which type of glands have ducts? Which don’t?
Exocrine has ducts
Endocrine has no ducts
Epithelium consists almost entirely of ____, and it covers ___ _____ and forms _____.
Cells
Body surfaces
Glands
Epithelium has ____ and _____ surfaces.
free and basal
Does epithelium have blood vessels?
No , but exception in ear
Epithelium undergoes what types of cell division?
Mitosis
Epithelial tissue cells are joined by ____ ____, which increase____ and create _____.
junctional complexes
strength
barriers
Epethilia cells are separated from underlying tissue via?
Basement membrane
What is the functions of cell connections?
Bind cells together
Form permability layer
Intercellular communication
What are the four types of cell connections?
Desosomes (cadherins)
Hemidesmosome (integrin)
Tight (occludins)
Gap
Plasma membranes can join together to form?
tight junctions
In _______ junctions membranes are “glued” together by ______ that pass through both membranes and attach to ______.
Adherens
proteins
cytoskeleton
In ________ proteins “button” two membranes together
desmosomes
What is transitional epithelium?
Cuboidal to columnar when not stretched and squamous-like when stretched
Location of simple squamous epithelium?
- lining of air sacs
- Glomerular capsule
- Inner cornea
- Eardrum
What is endothelium?
Simple squamous epithelium that lines heart,, blood and lymphatic vessels, and capillaries
What is mesothelium?
SS epithelium that lines ventral body cavity and is part of serous membrane
Function of simple squamous epithelium?
Filtration
Absorption
Secretion
Location of cuboidal epithelial
Surface of ovary
Crystalline lens
kidney tubules
Ducts of many glands
Function of cuboidal epithelial
Secretion and absorption
Location of ciliated simple columnar.
Upper resp. tract and uterine (fallopian) tubes
Simple membranes are specialized for _____
transport
Stratified membranes are specialized for ______
protection
Keratinized membranes have an outer layer of ____ cells
dead
Location of stratified squamous epithelial.
Nonkeratinized (lines wet surfaces) 1. Mouth 2. Esophagus 3. Epiglottis 4. Vagina Keratinized 1. Outer layer of skin
Function of stratified squamous
protection
Location of stratified cuboidal
Ducts of adult sweat glands
Function of stratified squamous
protection
location of stratified columnar
Lines part of male urethra
larger secretory ducts
Function of stratified columnar
protection and secretion
Loaction of transitional epithelium
Line Urinary tract
Function of transitional
permits distention
Location of psuedostratified epithelium
lines most of upper resp. tract
some ducts of male reproductive system ( larger exceretory ducts)
Function of psuedostratified epithelium
secretion
Psuedostratified ciliated epithelium has ____ cells
goblet.
Give an example of a unicellular exocrine gland
Goblet cell
What is a cluster of tubes in an multicellular exocrine gland called?
acini